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248 jpm 1 
<?php
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// $Id: Prefilter.php,v 1.1 2005-01-20 19:43:20 jpm Exp $
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/**
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*
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* "Pre-filter" the source text.
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*
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* Convert DOS and Mac line endings to Unix, concat lines ending in a
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* backslash \ with the next line, convert tabs to 4-spaces, add newlines
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* to the top and end of the source text, compress 3 or more newlines to
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* 2 newlines.
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*
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* @author Paul M. Jones <pmjones@ciaweb.net>
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*
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* @package Text_Wiki
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*
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*/
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class Text_Wiki_Parse_Prefilter extends Text_Wiki_Parse {
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    /**
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    *
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    * Simple parsing method.
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    *
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    * @access public
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    *
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    */
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    function parse()
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    {
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        // convert DOS line endings
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        $this->wiki->source = str_replace("\r\n", "\n",
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            $this->wiki->source);
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        // convert Macintosh line endings
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        $this->wiki->source = str_replace("\r", "\n",
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            $this->wiki->source);
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        // concat lines ending in a backslash
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        $this->wiki->source = str_replace("\\\n", "",
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            $this->wiki->source);
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        // convert tabs to four-spaces
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        $this->wiki->source = str_replace("\t", "    ",
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            $this->wiki->source);
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        // add extra newlines at the top and end; this
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        // seems to help many rules.
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        $this->wiki->source = "\n" . $this->wiki->source . "\n\n";
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        // finally, compress all instances of 3 or more newlines
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        // down to two newlines.
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        $find = "/\n{3,}/m";
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        $replace = "\n\n";
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        $this->wiki->source = preg_replace($find, $replace,
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            $this->wiki->source);
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    }
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}
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?>